Feature Description
Virtual Routing and Forwarding (VRF) is a technology that allows multiple instances of a routing table to coexist within the same router at the same time. As the routing instances are independent, the same or overlapping IP addresses can be used without conflicting with each other.
In UPF, the feature enables association of IP address pools with VRF. These IP pools are chunked like any pools. The chunks from this pool are allocated to the UPFs that are configured to use these pools. VRF-associated pools in UPF can only be of type—STATIC or PRIVATE.
The chunks in the PRIVATE VRF pool are allocated when the UPF comes up for registration, similar to the normal private pools. For STATIC VRF pool, the SMF does chunk allocation to UPF during the time of configuration. An SX-Route-Update message is sent for pre-allocated static-chunks during UPF registration.